How do I change my payment to a new credit card

Sign in to your Apple ID account page and edit / update your Apple ID details.

https://appleid.apple.com                                                     

• On the Sidebar click Payment methods -> then tap Payments Methods and tap Manage payment method.

Or -> Add a payment method to your Apple ID

Add a payment method to your Apple ID – Apple Support (UK)

• If you want to change your card, you need to add first the new card, then remove the old card.

Or -> If you need to change or update your Apple ID payment method

If you need to change or update your Apple ID payment method - Apple Support